Guarantee Arrangements and Pledged Assets and Repurchase Agreements - Offsetting of Resale and Repurchase Agreements and Securities Borrowing and Lending Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Securities purchased under agreements to resell, Gross Amounts Recognized	$ 12,871	$ 41,382
Securities purchased under agreements to resell, Gross Amounts Offset in the Balance Sheet	2,357	5,636
Securities purchased under agreements to resell, Net amounts Presented in the Balance Sheet	10,514	35,746
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	10,464	35,746
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Receive / Pledged	50	0
Securities purchased under agreements to resell, Net amount	0	0
Securities sold under repurchase agreements, Gross Amounts Recognized	4,672	7,401
Securities sold under repurchase agreements, Gross Amounts Offset in the Balance Sheet	2,357	5,636
Securities sold under repurchase agreements, Net Amounts Presented in the Balance Sheet	2,315	1,765
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance sheet, Financial Instruments	2,315	1,762
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received / Pledged	0	0
Securities sold under repurchase agreements, Net amount	$ 0	$ 3